CSS3 Selectors (with ie support)

<style>
input[value=test] {background-color:#000; color:#fff;}
ul.odd li:nth-child(odd) { background-color:#eee; }
</style>
<input value="test" /> notice i have selected this input tag by using the <code class="inline">input[value=test]</code> you can exchange the "attribute type"="value for the attribute" anyway you want.
<ul class="odd"><li>Odd</li><li>Even</li><li>Odd</li><li>Even</li></ul>
notice i have selected this input tag by using the input[value=test] you can exchange the "attribute type"="value for the attribute" anyway you want.